M2.8 earthquake 2km NNE of Calimesa, CA
A magnitude 2.8 earthquake struck 2km NNE of Calimesa, CA on Sat, Dec 9, 1939, 10:46 AM GMT-8 (18:46 UTC), 22 km (13 mi) below the surface.
A larger quake followed: M3.1 4km SSW of Yorba Linda, CA. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 2.8 (ml), micro
- Local time
- UTC
- 1939-12-09 18:46:39 UTC
- Depth
- 21.6 km (13.4 mi), shallow
- Epicenter
- 34.009° N, 117.043° W
- Region
- California
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Did you feel it?
No one has reported feeling this quake to the USGS.
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 7.7 km horizontally, 4.5 km in depth
- Magnitude uncertainty
- ±0.43
- Depth from
- From location
- Station coverage gap
- 241°, poorly surrounded by stations
- Stations used
- 4
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 8 in the 60 days after this one and 5 in the 30 days before it.
After
- 2.76km S of Loma Linda, CA · 31684 days ago · 18 km deep · 19 km away
- 3.14km SSW of Yorba Linda, CA · 31684 days ago · 6 km deep · 74 km away
- 2.65km SE of Loma Linda, CA · 31674 days ago · 6 km deep · 17 km away
- 2.411km W of Adelanto, CA · 31669 days ago · 6 km deep · 79 km away
- 2.68km SSW of Beaumont, CA · 31665 days ago · 19 km deep · 17 km away
- 3.319km E of Big Bear City, CA · 31661 days ago · 6 km deep · 46 km away
- 2.610km E of Barstow, CA · 31661 days ago · 6 km deep · 100 km away
- 3.29km NE of Indio, CA · 31658 days ago · 6 km deep · 86 km away
Before
- 3.07km E of Yucaipa, CA · 31717 days ago · 6 km deep · 7 km away
- 1.92km SE of Huntington Beach, CA · 31719 days ago · 6 km deep · 95 km away
- 2.42km NNE of Anaheim, CA · 31721 days ago · 6 km deep · 79 km away
- 3.010km NNE of Borrego Springs, CA · 31725 days ago · 6 km deep · 99 km away
- 2.94km SE of Grand Terrace, CA · 31728 days ago · 19 km deep · 22 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event ci3365166. Read Tue, Sep 22, 2026, 8:24 PM UTC.